Add Supported Platforms to setup.py

[vfrank66]

While installing kiner for some lambda functions my pip install does not accept kiner 0.8.0 but instead only accepts 0.6.4, 0.6.2

ERROR: Could not find a version that satisfies the requirement kiner==0.8.0 (from versions: 0.6.2, 0.6.4)

pip3 install -r requirements-temp.txt \
      --platform manylinux1_x86_64 \
      --only-binary=:all: 

I think it is related to setup.py can you add the supported platforms or add
platforms=['any'],

Here is an example: https://github.com/pandas-dev/pandas/blob/main/setup.cfg#L11

[davidgasquez]

Heya @vfrank66! Thanks for opening the issue. Would you be up for sending a PR with the prosposed changes?